Best way to run Julia code in an IPython notebook (or Python code in an IJulia notebook)

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Run Julia inside an IPython notebook

Hack

In order to run Julia snippets (or other language) inside an IPython notebook, I just append the string 'julia' to the default list in the _script_magics_default method from the ScriptMagics class in:

  • /usr/lib/python3.4/site-packages/IPython/core/magics/script.py or
  • /usr/lib/python2.7/site-packages/IPython/core/magics/script.py.

Example:

# like this:
defaults = [
    'sh',
    'bash',
    'perl',
    'ruby',
    'python',
    'python2',
    'python3',
    'pypy',
    'julia', # add your own magic
]
  • Example notebook (using Python3)

IPython *Julia magic*

Julia Magic (Bi-directional)

To use %load_ext julia.magic, you would need to run the setup.py here:

Update (09/04/2014): the setup.py file has been moved to pyjulia.jl:

  • https://github.com/JuliaLang/pyjulia


Which you get when Pkg.add("IJulia") clones the repo in your filesystem:

cd ~/.julia/v0.3/IJulia/python/
sudo python2 setup.py install

Currently this only works for me in Python2. Python3 complains about:

ImportError: No module named 'core'

when I try to load the extention, but installs without complains.

After installing it you can also do this from inside Python2:

from julia import Julia
j = Julia()
arr = j.run('[1:10]')
type(arr) # numpy.ndarray
  • http://blog.leahhanson.us/julia-calling-python-calling-julia.html

Runing a script from your system shell

Use the shell mode syntax in a notebook cell:

!julia my_script.jl

Run Python inside IJulia notebook

Using PyCall

It’s not really running python code in the context you want, but you can also use Python libraries from within Julia:

using PyCall
@pyimport math
println(math.pi)
  • https://github.com/stevengj/PyCall.jl

Runing a script from your system shell

Use the shell mode syntax in a notebook cell:

;python my_script.py
  • http://julia.readthedocs.org/en/latest/manual/interacting-with-julia/?highlight=shell#shell-mode

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